func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject])
{
    picker.dismissViewControllerAnimated(true, completion: nil)

    let pickedImage = info[UIImagePickerControllerOriginalImage] as! UIImage

    if picker.sourceType == .Camera
    {
        // When taking a picture with the camera, store it in the user roll
        PHPhotoLibrary.sharedPhotoLibrary().performChanges(
            { () -> Void in

                // save the image
                PHAssetCreationRequest.creationRequestForAssetFromImage(pickedImage)

                // TODO how to get the asset url

            }, completionHandler:
            { (finished, error) -> Void in
                if (finished)
                {

                }
            }
        )

    }
    else
    {
        let pickedImageUrl: NSURL? = info[UIImagePickerControllerReferenceURL] as? NSURL

        currentImageUrl = pickedImageUrl

        currentImage = pickedImage

        toggleImageInfoView(true)
        toggleMapState(true)
    }


}

UIImageWriteToSavedPhotosAlbum(image.image, self, #selector(cameraImageSavedAsynchronously), nil)

func fetchLastImage(completion: (localIdentifier: String?) -> Void)
{
    let fetchOptions = PHFetchOptions()
    fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
    fetchOptions.fetchLimit = 1

    let fetchResult = PHAsset.fetchAssetsWithMediaType(.Image, options: fetchOptions)
    if (fetchResult.firstObject != nil)
    {
        let lastImageAsset: PHAsset = fetchResult.firstObject as! PHAsset
        completion(localIdentifier: lastImageAsset.localIdentifier)
    }
    else
    {
        completion(localIdentifier: nil)
    }
}

let fetchResult = PHAsset.fetchAssetsWithMediaType(.Image, options: fetchOptions)
fetchResult.firstObject

__block PHObjectPlaceholder *placeholderAsset = nil;
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
    PHAssetChangeRequest *newAssetRequest = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:url];
    newAssetRequest.location = location;
    newAssetRequest.creationDate = [NSDate date];
    placeholderAsset = newAssetRequest.placeholderForCreatedAsset;
} completionHandler:^(BOOL success, NSError *error) {
    if(success){
        PHAsset *asset = [self getAssetFromlocalIdentifier:placeholderAsset.localIdentifier];
        completionBlock(asset, YES);
    } else {
        completionBlock(nil, NO);
    }
}];